Diagnostic Test

1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.

Did the DTC return?

Yes 

• Go To  2

No 

• Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .

1. Turn the ignition off.
2. Disconnect the harness connector at the component of the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
3. Turn the ignition on.
4. Using a DVOM, measure the voltage of the circuit being tested at the component harness connector.

Is there voltage present?

Yes 

• Go To  3

No 

• Go To  4

1. The ignition must be off when performing a resistance check to find a short between circuits.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and every component harness connector containing the circuit being tested. At this time leave all in-line connectors connected. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
3. Connect one lead of the DVOM to the circuit being tested at the ECU harness connector.
4. With the other lead of the DVOM probe all other circuits at the ECU harness connector.

1. If it is necessary to probe a terminal at a PCM harness connector, connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
   NOTE:

   With the circuit isolated there should be no continuity between the circuit being tested and any other circuit.

   Is there continuity between the circuit being tested and any other circuit?

   Yes 

   • Repair the short between the circuits that have continuity. Use the wiring diagram as a guide to trace the circuits and look for any in-line connectors to help isolate the location of the short.
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

   No 

   • Go To  4

1. Turn the ignition off.
2. With the in-line harness connector disconnected, measure the resistance of the MDS solenoid at the MDS solenoid side of the in-line harness connector.

   Is the resistance less than 25 Ohms?

   Yes 

   • Go To  5

   No 

   • Visually inspect the wiring harness between the in-line harness connector and the MDS Solenoid connector and repair as necessary. If the wiring harness is OK, replace the MDS Solenoid in accordance with the Service Information. Refer to SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL AND INSTALLATION, 5.7L .
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

1. With the scan tool, erase DTCs.
2. Turn the ignition off.
3. Reconnect the PCM harness connector.
4. Ignition on, engine not running.
5. Using a 12-volt test light connected to the Ground circuit, probe the MDS Solenoid 4 (K452) Control circuit at the PCM side of the in-line harness connector.
6. With a scan tool, actuate the MDS Solenoid.

   Does the 12-volt test light flash on and off?

   Yes 

   • Go To  6

   No 

   • Go To  8

1. Turn the ignition off.
2. Remove the Intake Manifold in accordance with the service information. Refer to MANIFOLD, INTAKE, REMOVAL AND INSTALLATION, 5.7L .
3. Turn the ignition on.
4. With the scan tool actuate the MDS Solenoid 4.

   Can you feel and hear the Solenoid Actuating?

   Yes 

   • Go To  7

   No 

   • Replace the MDS Solenoid 4 in accordance with the Service Information. Refer to SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL AND INSTALLATION, 5.7L . Check the oil passages for debris that may be blocking the oil passages (3) to the Solenoid before installing the new one.
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

1. Turn the ignition off.
2. Remove both Solenoids (4 and 6) on Bank 2 of the engine block in accordance with the service information. Refer to SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL AND INSTALLATION, 5.7L .
3. Remove the Bank 2 Cylinder Head in accordance with the service information. Refer to CYLINDER HEAD ASSEMBLY, REMOVAL AND INSTALLATION, 5.7L .
4. Remove the Lifters from the right engine bank.
5. Inspect the oil passages to the Solenoids and from the Solenoids to the lifters.

   Are the passages blocked?

   Yes 

   • Clean the oil passages as necessary. If the entire engine is restricted disassembly of the entire engine block may be necessary.
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

   No 

   • Replace both sets of lifters if no other possible causes remain. Refer to LIFTER(S), HYDRAULIC, ROLLER, REMOVAL AND INSTALLATION, 5.7L .
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
   • Proper connector installation.
   • Damaged connector locks.
   • Corrosion.
   • Other signs of water intrusion.
   • Weather seal damage (if equipped).
   • Bent terminals.
   • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
   • Terminals that have been pushed back into the connector cavity.
   • Check for spread terminals and verify proper terminal tension.

   Repair any conditions that are found.

6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.

    Did the DTC return?

    Yes 

    • Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
    • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

    No 

    • The wiring or poor connection problem has been repaired.
    • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .